border

To set custom border settings specific to the 'selected' state for points in all series at once, use the properties of the commonSeriesSettings | point | selectionStyle | border configuration object.

To set custom border settings specific to the 'selected' state for points in all series of a single type at once, use the properties of the corresponding object within commonSeriesSettings (e.g. area | selectionStyle | border). The values that are set within this object override the corresponding common values that are set within the root commonSeriesSettings | selectionStyle | border object.

In case you have to set a selection style option for a point border in an individual series, use the selectionStyle | border object within the series object of the series array. The values that are set individually override corresponding common values.